Since the start of the isomorphic-git project, I have hosted an instance of cors-buster proxy to get around the fact that none of the major git hosting sites use CORS headers that would allow browsers to clone. This proxy is free, open source, and easy to install.
Unfortunately, this proxy also used a whopping 5 TERABYTES of bandwidth last month, and I got hit with a $500 charge from my favorite hosting service ever now.sh. (They say they are working on making bandwidth usage more transparent... it would have been good to get a notification....) Either a lot of cloning has been going on (which is GREAT!) or somebody has discovered the proxy can be abused. Either way, paying $500/month is not within isomorphic-git's budget.
(You could change that! Sponsor us on OpenCollective!)
So for now I've had to suspend the proxy until I find time to write some spiffy bandwidth-limiting logic for it.
Don't let this stop you from playing with isomorphic-git! Clone https://github.com/wmhilton/cors-buster, or npm install it, or deploy your own instance on Now.
Update: ZEIT has donated credit to cover this month's surprise bandwidth, plus some extra! Aren't they great?